ATV/UTV Engine
ATV/UTV Engine Parts at JJ Motorsports
Maximize your ATV or UTV's engine life with top-quality components from JJ Motorsports. Our selection includes gasket kits, connecting rods, water pump rebuild kits, and timing plugs designed for reliable sealing, strength, and easy installation in demanding off-road conditions. Compatible with Polaris, Can-Am, Honda, and more, these parts ensure peak power, reduced wear, and efficient operation for trail riding or utility work.
Shop trusted brands like Moose Racing for rebuild kits and Winderosa for gaskets. Explore related categories such as ATV/UTV air and fuel for intake upgrades or ATV/UTV drivetrain for transmission enhancements.
Top ATV/UTV Engine Products
- MOOSE UTILITY Clutch Cover Gasket Seal 500-1265-PU – Durable seal for clutch cover protection.
- WINDEROSA Standard Bore Gasket Kit 810585 – Complete kit for engine sealing and rebuilds.
- WORKS CONNECTION Engine Timing Plug 24-590 – Precision plug for accurate timing adjustments.
- MOOSE RACING Connecting Rod MR5026 – High-strength rod for engine durability.
- MOOSE RACING Water Pump Rebuild Kit 821865 – Comprehensive kit for water pump maintenance.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
HOT RODS Standard Cylinder - Rear 30008
HOT RODS
$499.95When your brake system demands reliability under extreme conditions, OEM-quality cylinders are non-negotiable. The HOT RODS Standard Cylinder delivers factory performance without the factory...09310506- SKU:
- 09310506
- Availability:
- Ships Same Business Day
- Weight:
- 3.70 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.8:1
- RIDING STYLE:
- ATV
- TYPE:
- REAR
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- 85.00 MM
- PRODUCT NAME:
- CYLINDER
- UNITS:
- EACH
$499.95 -
HOT RODS Standard Cylinder - Front 30007
HOT RODS
$499.95When your brake system demands reliability under sustained track conditions or street driving, OEM-spec cylinders that won't require costly re-plating represent a smart investment in consistency and...09310505- SKU:
- 09310505
- Availability:
- Ships Same Business Day
- Weight:
- 3.70 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.8:1
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER
- BORE SIZE METRIC:
- 85.00 MM
- RIDING STYLE:
- UTV
- TYPE:
- FRONT
$499.95 -
HOT RODS Big Bore Cylinder Kit 31007-K01
HOT RODS
$1,612.95If you're looking to increase displacement and power output without extensive machine work, big bore cylinders are a direct path to measurable performance gains. The HOT RODS Big Bore Cylinder Kit...09310504- SKU:
- 09310504
- Availability:
- Ships Same Business Day
- Weight:
- 8.70 LBS
- BORE SIZE METRIC:
- 91.00 MM
- FEATURES:
- FRONT
- OVERBORE METRIC:
- +6.00 MM
- RIDING STYLE:
- ATV
- FEATURES:
- REAR
- COLOR/FINISH:
- ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- UTV
- DISPLACEMENT:
- 800 CC
- FEATURES:
- MAY REQUIRE CASE BORING
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
$1,612.95Qty in Cart: 0Quantity:Price:$1,612.95Subtotal: -
Cylinder Works Big Bore Cylinder Kit Yamaha Grizzly 700 2007-2013 21104-K01
CYLINDER WORKS
$1,011.95If you're running a Grizzly 700 and want measurable gains in power without tearing down your engine to the bare block, this big bore cylinder kit delivers. The bolt-on design means you'll spend your...09310375- SKU:
- 09310375
- Availability:
- Ships Same Business Day
- Weight:
- 10.42 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.2:1
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 105,00 MM
- CYLINDER DIAMETER METRIC:
- 105.00 MM
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- RIDING STYLE:
- UTV
- DISPLACEMENT:
- 727 CC
$1,011.95 -
Cylinder Works Big Bore Cylinder Kit Honda TRX700XX 2008-2009 11009-K01
CYLINDER WORKS
$853.95If you're running a Honda TRX700XX and want genuine performance gains without complicated machine work, the Cylinder Works Big Bore Kit delivers tangible displacement and power increases with a...09310332- SKU:
- 09310332
- Availability:
- Ships Same Business Day
- Weight:
- 8.28 LBS
- DISPLACEMENT:
- 727 CC
- RIDING STYLE:
- ATV
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 105,00 MM
- CYLINDER DIAMETER METRIC:
- 105.00 MM
- OVERBORE METRIC:
- +3.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.1:1
- ENGINE TYPE:
- 4-CYCLE
$853.95 -
Cylinder Works Honda TRX700XX 2008-2009 Standard Bore Cylinder Kit 10009-K01
CYLINDER WORKS
$744.95The stock cylinder on your TRX700XX will eventually wear, causing power loss and increased blowby. This Cylinder Works kit gives you a direct bolt-on refresh with precision-matched components,...09310331- SKU:
- 09310331
- Availability:
- Ships Same Business Day
- Weight:
- 7.61 LBS
- CYLINDER DIAMETER METRIC:
- 102.00 MM
- RIDING STYLE:
- ATV
- DISPLACEMENT:
- 686 CC
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-CYCLE
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 102,00 MM
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
$744.95 -
On Sale
ATHENA Cylinder Kit - KFX450 - 96mm P400250100009
ATHENA
MSRP: $772.95Now: $696.00Was: $772.95The ATHENA Cylinder Kit delivers measurable displacement gains and improved thermal management for your KFX450, translating directly to increased power output and engine reliability in demanding...09310253- SKU:
- 09310253
- Availability:
- Ships Same Business Day
- Weight:
- 4.77 LBS
- ENGINE TYPE:
- 4-STROKE
- BORE SIZE METRIC:
- 96.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- RIDING STYLE:
- ATV
- DISPLACEMENT:
- 450 CC
- MATERIAL:
- ALUMINUM
- STYLE:
- STOCK BORE
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
MSRP: $772.95Now: $696.00Was: $772.95Qty in Cart: 0Quantity:Price:MSRP: $772.95Now: $696.00Was: $772.95Subtotal: -
On Sale
ATHENA Cylinder Kit - YFZ350 - 68mm P400485100024
ATHENA
MSRP: $1,297.95Now: $1,263.00Was: $1,297.95The ATHENA Cylinder Kit delivers measurable displacement gains and improved cooling efficiency for your YFZ350, translating to increased horsepower and sustained performance during extended riding...09310249- SKU:
- 09310249
- Availability:
- Ships Same Business Day
- Weight:
- 10.61 LBS
- BORE SIZE METRIC:
- 68.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- DISPLACEMENT:
- 392 CC
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
MSRP: $1,297.95Now: $1,263.00Was: $1,297.95 -
Cylinder Works Big Bore Cylinder Kit 474cc 2006-2009 Suzuki LT-R450 41002-K01
CYLINDER WORKS
$858.95Stock 450cc displacement leaves performance on the table. The Cylinder Works Big Bore Kit expands your LT-R450 to a full 474cc, delivering measurable increases in torque and power without sacrificing...09310176- SKU:
- 09310176
- Availability:
- Ships Same Business Day
- Weight:
- 3.76 LBS
- DISPLACEMENT:
- 477 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER DIAMETER:
- 98,00 MM
- CYLINDER DIAMETER METRIC:
- 98.00 MM
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- OVERBORE METRIC:
- +2.50 MM
- STYLE:
- BIG BORE
$858.95Qty in Cart: 0Quantity:Price:$858.95Subtotal: -
Cylinder Works Honda TRX450R 2006-2009 Big Bore Kit 477cc 11005-K01
CYLINDER WORKS
$786.95If you're running a 2006-2009 Honda TRX450R and want measurable gains in power and reliability without a full engine rebuild, the Cylinder Works 477cc Big Bore Kit delivers exactly that. This bolt-on...09310175- SKU:
- 09310175
- Availability:
- Ships Same Business Day
- Weight:
- 4.30 LBS
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- COMPRESSION RATIO IMPERIAL:
- 12.1:1
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- RIDING STYLE:
- ATV
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- OVERBORE METRIC:
- +3.00 MM
- UNITS:
- KIT
- CYLINDER DIAMETER:
- 99,00 MM
- DISPLACEMENT:
- 477 CC
$786.95 -
Cylinder Works Standard Bore Cylinder Kit for Suzuki LT-R450 2006-2009 40002
CYLINDER WORKS
$456.70When your LT-R450's cylinder starts showing signs of wear, you need a direct replacement that restores OEM performance without compromise. The Cylinder Works Standard Bore Cylinder Kit delivers...09310166- SKU:
- 09310166
- Availability:
- Ships Same Business Day
- Weight:
- 2.91 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.7:1
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- CYLINDER DIAMETER:
- 95,50 MM
- ENGINE TYPE:
- 4-CYCLE
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 95.50 MM
- DISPLACEMENT:
- 449 CC
- PRODUCT NAME:
- CYLINDER
$456.70 -
On Sale
ATHENA Cylinder Kit - LTR450 - 100mm P400510100008
ATHENA
MSRP: $1,108.95Now: $998.00Was: $1,108.95The ATHENA Cylinder Kit delivers measurable gains in displacement and compression, translating directly to increased horsepower and torque on your LTR450. Built with a nickel-carbide coated aluminum...09310116- SKU:
- 09310116
- Availability:
- Ships Same Business Day
- Weight:
- 3.96 LBS
- ENGINE TYPE:
- 4-STROKE
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- RIDING STYLE:
- ATV
- DISPLACEMENT:
- 490 CC
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 100.00 MM
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $1,108.95Now: $998.00Was: $1,108.95 -
On Sale
ATHENA Cylinder Kit - LTR450 P400510100007
ATHENA
MSRP: $772.95Now: $696.00Was: $772.95A worn or damaged cylinder limits your LTR450's potential and reliability on the track. The ATHENA Cylinder Kit P400510100007 restores full compression and thermal efficiency with OEM-quality...09310115- SKU:
- 09310115
- Availability:
- Ships Same Business Day
- Weight:
- 4.24 LBS
- PRODUCT NAME:
- CYLINDER KIT
- DISPLACEMENT:
- 450 CC
- STYLE:
- STOCK BORE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 95.50 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
MSRP: $772.95Now: $696.00Was: $772.95 -
On Sale
ATHENA Cylinder Kit - YZ450F - 98mm P400485100016
ATHENA
MSRP: $820.95Now: $739.00Was: $820.95The ATHENA Cylinder Kit for YZ450F delivers measurable displacement gains and thermal efficiency improvements that translate directly to higher horsepower and reliability in competition or trail...09310022- SKU:
- 09310022
- Availability:
- Ships Same Business Day
- Weight:
- 4.51 LBS
- DISPLACEMENT:
- 478 CC
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 98.00 MM
- CYLINDER BORE COATING:
- NICKEL-CARBIDE
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
MSRP: $820.95Now: $739.00Was: $820.95Qty in Cart: 0Quantity:Price:MSRP: $820.95Now: $739.00Was: $820.95Subtotal: -
Hot Cams Exhaust Valve for 2013-2014 Polaris RZR 900 HC00040
HOT CAMS
$39.95Your RZR 900's exhaust valve is the critical bridge between combustion and exhaust flow—any weakness here directly impacts horsepower, throttle response, and engine longevity. The HOT CAMS HC00040...09263113- SKU:
- 09263113
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- STEM DIAMETER METRIC:
- 5.460 MM
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
$39.95 -
Hot Cams Steel Exhaust Valve for Polaris Sportsman 850 XP 2009-2011 HC00039
HOT CAMS
$25.95Your Polaris Sportsman 850 XP's engine performance depends on valves that can handle extreme heat cycling and high RPM demands. This HOT CAMS forged exhaust valve is engineered for precision fitment...09263112- SKU:
- 09263112
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BASE COLOR:
- BLACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- COLOR/FINISH:
- BLACK
- STEM DIAMETER METRIC:
- 5.480 MM
- UNITS:
- EACH
$25.95 -
Hot Cams Steel Exhaust Valve for Polaris Ranger XP 1000 2017 HC00038
HOT CAMS
$51.40Factory exhaust valves wear down under sustained load and high RPM operation, causing compression loss and reduced power output. The Hot Cams HC00038 is a precision forged replacement that restores...09263111- SKU:
- 09263111
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- BASE COLOR:
- BLACK
- STEM DIAMETER METRIC:
- 5.460 MM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
$51.40 -
Hot Cams Steel Exhaust Valve for Polaris Sportsman 550 2012-2014 HC00037
HOT CAMS
$71.95Your Polaris Sportsman 550's engine demands a valve that can withstand extreme heat cycles and valve train stress without compromising sealing integrity. The HOT CAMS HC00037 Exhaust Valve is a...09263110- SKU:
- 09263110
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- EXHAUST
- COLOR/FINISH:
- BLACK
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- BASE COLOR:
- BLACK
- RIDING STYLE:
- ATV
- STEM DIAMETER METRIC:
- 5.95 MM
- UNITS:
- EACH
$71.95Qty in Cart: 0Quantity:Price:$71.95Subtotal: -
Hot Cams Intake Valve for 2018 Polaris Scrambler 850 HC00036
HOT CAMS
$39.95The HOT CAMS Intake Valve HC00036 restores flow efficiency and sealing integrity to your 2018 Polaris Scrambler 850, directly impacting throttle response and engine reliability under sustained...09263109- SKU:
- 09263109
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BASE COLOR:
- BLACK
- OUTSIDE DIAMETER METRIC:
- 30 MM
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- BLACK
- LENGTH METRIC:
- 118.60 MM
- RIDING STYLE:
- ATV
- STEM DIAMETER METRIC:
- 5.49 MM
- UNITS:
- EACH
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
Hot Cams Intake Valve for 2004 Polaris ATP 500 HC00035
HOT CAMS
$54.95If you're running your ATP 500 hard, your intake valve needs to match that intensity. The HOT CAMS HC00035 delivers the precision engineering and durability required for sustained high-performance...09263108- SKU:
- 09263108
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- BASE COLOR:
- BLACK
- LENGTH METRIC:
- 101 MM
- OUTSIDE DIAMETER METRIC:
- 31.00 MM
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- COLOR/FINISH:
- BLACK
- STEM DIAMETER METRIC:
- 5.95 MM
- UNITS:
- EACH
$54.95
